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CUT-AWAY OF VIKING INTERNAL PRESSURE REUEF VALVE FIGURE-cont.
Piping-cont.

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 Alignment CHECK ALIGNMENT AFTER MOUNTING For  detailed  coupling  alignment  procedures  see  Viking service bulletin ESB-61. The pump, drive, and motor were properly aligned at the time    they    were    assembled.        During    shipping    and mounting the alignment is often disturbed.  CHECK IT! 1. Check  pump  ports  to  be  sure  they  are  square and  in  proper  position;  shim  or  move  pump  as required. 2. If  the  pump  is  driven  by  a  flexible  coupling(s) either direct connected to the motor or through a reducer,  remove  any  coupling  guards  or  covers and  check  alignment  of  the  coupling  halves.    A straightedge (a  piece  of  key  stock  works  nicely) across  the   coupling   must   rest   evenly   on   both rims at the top, bottom, and sides.  See Figure 6. 3. If   the   pump   is   driven   by   V-belts,   check   the alignment by using a long straightedge or tightly drawn   string   across   the   face   of   the   sheaves. See Figure 6A. 4. Make  a  final  check  on  alignment  after  piping  is hooked  up.    See  item  13  under  "Installation  - Piping".  Figures 7, 8, and 9 show typical units-- direct, gear reducer and V-belt drive. 5. For  high  temperature  applications  (those  above 300°F) allow pump to reach operating temperature, then recheck alignment. FIGURE 6 FIGURE 6A Piping The cause of many pumping problems can be traced to suction piping It should always be as large and short as practical.    For  help  In  selecting  the  proper  size  piping, both  suction  and  discharge.    refer  to  Viking  General Catalog Section 510. Before   starting   layout   and   installation   of   your   piping system, consider the following points: 1    Never  use  piping  smaller  than  the  pump  port connections. 2    Be  sure  the  inside  of  the  pipe  is  clean  before hooking it up. 3    Foot valve - When pumping a light liquid with a suction lift, a foot valve at the end of the suction piping or a check valve In the first horizontal run will hold the liquid in the line and make it easier for the pump to prime.  Be sure the foot or check valve   is   big   enough   so   that   it   doesn't   cause excessive line loss. Page 3 - 1204







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